President Bush has called for an increase in troops for Iraq, but US forces are already stretched thin. The so-called "surge" means an escalation of 21,500 troops. Soldiers of the Army's 3rd Division, which led the invasion of Baghdad, is the first to leave for its third tour. How is the increase likely to be accomplished? How do soldiers feel about leaving their families to face brutal combat? Are the troops worried that the war has lost the support of those back home? What about post-traumatic stress disorder? We hear from the Pentagon about the prospects for other American soldiers.